Supernodes in nodal analysis?

Question

When do supernodes occur in nodal analysis?

Answer 1

supernode is just a convenient technique of eliminating one equation from the nodal analysis equations. It is usually not needed.

What is generally done is two (non - reference nodes) between which an souce is connect is considered as a supernode and currents entering the super node is equated to the current exiting the supernode as is done in nodal analysis.

For more and an example, you can refer to Hayt, Kimmerly, Durbin, Engineering Circuit Analysis